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terminalattach.go
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terminalattach.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package private
import (
"context"
"errors"
"fmt"
"os"
"os/exec"
c "github.com/containerd/console"
"github.com/containerd/containerd"
"github.com/containerd/containerd/namespaces"
"github.com/spf13/cobra"
"namespacelabs.dev/foundation/internal/cli/fncobra"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/fnerrors"
)
func newInternalTerminalAttach() *cobra.Command {
cmd := &cobra.Command{
Use: "attach",
Short: "Attach to an existing terminal.",
Args: cobra.ArbitraryArgs,
}
cmd.RunE = fncobra.RunE(func(ctx context.Context, args []string) error {
if len(args) == 0 {
return fnerrors.New("need at least one command to run")
}
cli, err := containerd.New("/var/run/containerd/containerd.sock")
if err != nil {
return err
}
containers, err := cli.Containers(namespaces.WithNamespace(ctx, "default"), fmt.Sprintf("labels.%q==%s", "nsc/ctr-container-type", "terminal-source"))
if err != nil {
return err
}
if len(containers) == 0 {
return errors.New("no terminal source registered")
}
target := containers[0]
execArgs := []string{
"exec", "-it",
}
if authSock := os.Getenv("SSH_AUTH_SOCK"); authSock != "" {
execArgs = append(execArgs, "-e", "SSH_AUTH_SOCK="+authSock)
}
for _, envvar := range []string{"NSC_ENDPOINT", "NSC_TOKEN_SPEC_FILE"} {
if v := os.Getenv(envvar); v != "" {
execArgs = append(execArgs, "-e", fmt.Sprintf("%s=%s", envvar, v))
}
}
execArgs = append(execArgs, target.ID())
execArgs = append(execArgs, args...)
stdin, err := c.ConsoleFromFile(os.Stdin)
if err != nil {
return err
}
cmd := exec.CommandContext(ctx, "nerdctl", execArgs...)
cmd.Stdin = stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
done := console.EnterInputMode(ctx)
defer done()
if err := stdin.SetRaw(); err != nil {
return err
}
defer stdin.Reset()
return cmd.Run()
})
return cmd
}